Book Image

Drupal 10 Development Cookbook - Third Edition

By : Matt Glaman, Kevin Quillen
Book Image

Drupal 10 Development Cookbook - Third Edition

By: Matt Glaman, Kevin Quillen

Overview of this book

This new and improved third edition cookbook is packed with the latest Drupal 10 features such as a new, flexible default frontend theme - Olivero, and improved administrative experience with a new theme - Claro. This comprehensive recipe book provides updated content on the WYSIWYG (What You See Is What You Get) editing experience, improved core code performance, and code cleanup. Drupal 10 Development Cookbook begins by helping you create and manage a Drupal site. Next, you’ll get acquainted with configuring the content structure and editing content. You’ll also get to grips with all new updates of this edition, such as creating custom pages, accessing and working with entities, running and writing tests with Drupal, migrating external data into Drupal, and turning Drupal into an API platform. As you advance, you’ll learn how to customize Drupal’s features with out-of-the-box modules, contribute extensions, and write custom code to extend Drupal. By the end of this book, you’ll be able to create and manage Drupal sites, customize them to your requirements, and build custom code to deliver your projects.
Table of Contents (17 chapters)

Creating a custom field type

Field types are defined using the plugin system. Each field type has its own class and definition. A new field type can be defined through a custom class that will provide schema and property information.

Field types define ways in which data can be stored and handled through the Field API on entities. Field widgets provide means for editing a field type in the user interface. Field formatters provide means for displaying the field data to users. Both are plugins and will be covered in later recipes.

In this example, we will create a simple field type called realname to store the first and last names and add it to a comment type.

Getting ready

This recipe adds a field to a comment type, which requires the Comment module to be installed. The Comment module is installed by default with a standard Drupal installation.

How to do it…

  1. First, we need to create the src/Plugin/Field/FieldType directory in the module’s directory...